An object with a mass of 2.0 kg accelerates 2.0 m/s 2when an unknown force is applied to it. What is the amount of force?

4 N

Explanation:

mass = 2 kg

acceleration = 2 m/s^2

Force = mass * acceleration

         = 2 *2

         = 4 N

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this